We hope to showcase that server-side data aggregation by user is not actually needed.
If your business is audience measurement, advertisement,
analytics. It is possible to avoid using user tracking techniques, all information that
you require can be gathered using client-side aggregation, which is free of side-effects.
Check out the green-tracker agent). If your business is to really track users,
then move along, nothing to see here.

After clicking around a bit you can see what green-trackers has "learned" about you: